Re: [PATCH] udmabuf: Add support for mapping hugepages (v2)

Hi,

for (pgidx = 0; pgidx < pgcnt; pgidx++) {

• 	if (is_file_hugepages(memfd)) {
  

• 		hpage = find_get_page_flags(
  

• 				file_inode(memfd)->i_mapping,
  

• 				pgoff, FGP_ACCESSED);
  

• 		if (IS_ERR(hpage)) {
  

• 			ret = PTR_ERR(hpage);
  

• 			goto err;
  

• 		}
  

• 		page = hpage + (subpgoff % maxsubpgs);
  

• 		get_page(page);
  

• 		put_page(hpage);
  

if (hpage && subpgoff == maxsubpgs) { put_page(hpage); hpage = NULL; } if (!hpage) { hpage = find_get_page_flags(...) [ ... ] }

Only lookup the huge page when you cross a hugepage border.

take care, Gerd